The team featured several prominent players of the time, including Newsy Lalonde who would be inducted into the Hockey Hall of Fame and Bruce Ridpath, who would manage the Toronto entry in the National Hockey Association (NHA), fore-runner of the National Hockey League (NHL).
On November 14, 1906, the Ontario Hockey Association (OHA) banned Bruce Ridpath, Rolly Young and Harry Burgoyne from playing with the Toronto Marlboros. The three had been receiving money to play, strictly banned by the OHA. On November 22, Ridpath announced the formation of the Toronto Pros. Ridpath would be captain, and Alexander Miln was named as manager. Miln was manager of the Mutual Street Rink and had previously managed the Toronto Wellingtons, Stanley Cup challengers in 1902. On November 24, Miln attended a meeting of the International Hockey League (IHL) and secured a place in the IHL for the Pros for the 1907–08 season. For the initial season, the Toronto Pros would play only exhibition games.
Toronto would play its first game on December 28, 1906 against the Canadian Soo team of the IHL, losing 7–0 at the Mutual Street Rink in Toronto. The team did not receive its new white and purple sweaters in time for the game, and played the first game in used sweaters of the Marlboros.
The club helped found the Ontario Professional Hockey League in December 1907, beginning play in 1908. The team won the league championship in their first OPHL season. After the season, the Torontos would challenge for the Stanley Cup.